Most invasive species, such as bullfrogs and snails. It was originally introduced to develop the economy. These species have relatively strong genes and can replace local economic species to some extent.
However, as an invasive species, China people have different opinions, and I don't know when it started. These snails can be found everywhere in rural rice fields.
The spread of Ampullaria canaliculata in China
In fact, many people don't know where the snail's hometown is. In fact, the origin of this snail is in the subtropical region of South America, and its distribution is relatively small at first. However, due to various introductions, the snail also appeared in many areas.
It is understood that Pomacea canaliculata was first introduced to Taiwan Province Province, China on 1979. The purpose of the introduction at that time was to eat. However, people found that the snails tasted bad after breeding, so they began to abandon them and eventually flooded.
However, Thailand, Japan, South Korea and other countries introduced Pomacea canaliculata into China one after another. However, because the taste was not popular with people, those farms finally gave it up, resulting in a large number of wild Pomacea canaliculata, which had a great impact.
In China, it was introduced as early as 198 1. At that time, a Brazilian Chinese introduced Pomacea canaliculata to Guangdong for farming. Later, after promotion, there are many breeding bases in Guangxi, Yunnan, Fujian, Jiangsu, Sichuan and other regions.
After decades of breeding, many wild snails have migrated northward. Nowadays, Ampullaria canaliculata can be seen everywhere in most areas south of the Yangtze River, and its existence has also had a great impact on rural areas.
Why can't we see many snails now?
Pomacea canaliculata can produce 1000 eggs per fetus and tens of thousands of eggs a year because of its strong reproductive ability, which is very harmful to crops such as rice and wheat. If the quantity is not controlled, it will lead to a reduction in grain production.
In addition, because Ampullaria canaliculata carries some trematodes, such as Angiostrongylus retroflexus, there are defects in edible value, which leads to few people dare to eat Ampullaria canaliculata.
But now in rural fields, these flooded snails are gradually out of sight. What happened?
Because the snail can't be eaten well, it can be made into feed at this time. After all, Pomacea canaliculata is bigger and more numerous. After later fishing and processing, it can be made into a good high-protein feed. Snails also have many natural enemies, such as ducks and geese. Snails caught in the field can also be fed to poultry, which can also reduce the cost of raising poultry, thus generating some economic benefits, which is also a feasible way. In order to directly reduce the number of Amphibia canaliculata, chemical control and some toxic drugs can be used, which can not only protect rice, but also directly kill Amphibia canaliculata. Normal spraying of pesticides and fertilizers can reduce many snails. Judging from these methods, even if snails don't serve on the table, there are many ways to eliminate them.
If there is a better way to "turn waste into treasure", the biological value can be improved.
In this regard, what do you think of the invasive species Pomacea canaliculata?